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On-board hydraulic fluid degasification system for a hydraulic hybrid vehicle

a hybrid vehicle and hydraulic fluid technology, applied in the direction of liquid degasification, separation process, foam dispersion/prevention, etc., can solve the problems of gas permeation tending to increase, piston accumulator can also be susceptible to nitrogen contamination, and the hydraulic system performance is degraded, so as to increase the rate of degasification and fluid separation, the effect of increasing the rate of fluid degasification

Inactive Publication Date: 2014-02-18
ENVIRONMENTAL PROTECTION AGENCY US
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Significantly increases the rate of deaeration and gas-liquid separation, providing an efficient, inexpensive, and on-board solution for maintaining hydraulic fluid quality in hydraulic hybrid vehicles.

Problems solved by technology

Unfortunately, all known bladder materials are somewhat permeable to nitrogen.
This causes the fluid in any bladder accumulator to become contaminated with dissolved nitrogen over time, leading to degraded performance of the hydraulic system.
Piston accumulators can also be susceptible to nitrogen contamination due to gas permeation across the seal of the piston.
Gas permeation tends to increase with higher operating pressures, and is a significant problem at the high pressures found in hydraulic hybrid vehicle systems (e.g., 5,000-7,000 psi).

Method used

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  • On-board hydraulic fluid degasification system for a hydraulic hybrid vehicle
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  • On-board hydraulic fluid degasification system for a hydraulic hybrid vehicle

Examples

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Embodiment Construction

[0013]Referring to FIG. 1, degasification device 100 is shown, including separation tank 101, separation screen 106, foam generating cup 104 and fluid inlet 103. Separation screen 106 effectively separates the interior volume of tank 100 into an upper section 151, meant for collection of gas and foam, and a lower section 152, meant for collection of degasified liquid. Fluid enters the upper section 151 from the low pressure side of a hydraulic fluid power circuit (not shown) by means of tube 103 and fluid inlet port 105 (alternatively, fluid could enter through an orifice in the separation tank 101 above cup 104, which orifice would also constitute a fluid inlet port, without need for a tube) into cup 104 which is open to upper section 151. A gap 110 exists between fluid inlet port 105 and fluid surface level 102 in cup 104. Gap 110 is occupied with air. Cup 104 may be attached to the interior of tank 101, or tube 103, or any static structure. The volume within separation tank 101 i...

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Abstract

A fluid degasification system for a hydraulic circuit includes a gas / fluid separation tank, a fluid entry passage directing fluid into a small foam generating cup containing foam and a small amount of additional fluid, thereby stimulating foam formation. A separation screen is positioned below the foam generating cup to receive bubbles formed in the cup and to allow liquid to pass through the screen to a degasified-fluid collecting chamber below the screen as the bubbles resting on the separation screen decompose.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from U.S. Provisional Application 61 / 470,300, “On-Board Hydraulic Fluid Degasification System for a Hydraulic Hybrid Vehicle,” filed on Mar. 31, 2011.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The invention is directed to removal of dissolved gases from hydraulic fluid in fluid power systems, in particular for hydraulic hybrid vehicle applications.[0004]2. Description of the Related Art[0005]Some fluid power systems use hydraulic accumulators. Hydraulic accumulators store hydraulic fluid that is pressurized against a gas cushion. The gas is physically separated from the fluid by a structure, such as a flexible bladder or a sliding piston. The most commonly used gas is nitrogen, due to its low cost and relatively inert properties. Unfortunately, all known bladder materials are somewhat permeable to nitrogen. This causes the fluid in any bladder accumulator to become contaminated with dissolved...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B01D19/02
CPCB01D19/0068B01D19/0063B01D19/0005
Inventor KRAMER, DUSTINWILLIAMS, DAVIDIMFELD, STERLING
Owner ENVIRONMENTAL PROTECTION AGENCY US